Super black eyespots of the Eyed elater
- Subject Areas
- Biodiversity, Entomology, Evolutionary Studies, Zoology
- super black, melanin, beetle, deimatic, aposematic, color, spectrum, scattering, startle, eyespot
- © 2019 Wong et al.
- This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ Preprints) and either DOI or URL of the article must be cited.
- Cite this article
- 2019. Super black eyespots of the Eyed elater. PeerJ Preprints 7:e27746v1 https://doi.org/10.7287/peerj.preprints.27746v1
Scattering of light by surface structures leading to near complete structural absorption creates an appearance of “super black.” Well known in the natural world from bird feathers and butterfly scales, super black has evolved independently from various anatomical structures. Due to an exceptional ability to harness and scatter light, these biological materials have garnered interest from optical industries. Here we describe the false eyespots of the Eyed elater click beetle, which attains near complete absorption of light by an array of vertically-aligned microtubules. These cone-shaped microtubules are modified hairs (setae) that are localized to eyespots on the dorsum of the beetle, and absorb 96.1% of incident light (at a 24.8° collection angle) in the spectrum between 300 – 700 nm.
Version 1 of manuscript.
Supplemental Movie: Eyed elater click beetle, Alaus oculatus, false eyespot coated with a 40-nm layer of platinum and palladium, tilt sequence
Tilt sequence from 30° view to 80° view.